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Method for efficiently preparing ferrate based on nascent interfacial activity

a technology of interfacial activity and efficient preparation, which is applied in the field of compound preparation, can solve the problems of high investment cost and restricted application of ferrate salts in large scale, and achieve the effects of reducing the heat produced by the reaction between oxidants, alkali and iron in the nascent state, and large surface area ratio

Active Publication Date: 2019-02-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]The present invention utilizes divalent or trivalent iron salt and weak alkaline solution for hydrolysis reaction to produce iron in nascent state while a portion of the energy is released in the hydrolysis of iron ions at the same time; therefore the heat produced by the reaction between oxidants, the alkali and the iron in nascent state is reduced dramatically. Accordingly, the method of the present invention can be used under a relatively large temperature range and no ice bath is required. Also, the nascent state iron produced has a large surface area ratio and strong reactivity, thus the reaction can occur quickly and steadily. In addition, in the process of preparing ferrate of the present invention, a stabilizing agent which contains one or more of sodium perchlorate, sodium carbonate, potassium carbonate, sodium pyrophosphate, sodium silicate, peracetic acid, hydrogen peroxide, sodium hypochlorite, potassium hypochlorite, sodium phosphate is added such that the stability of the ferrate solution being produced is increased dramatically and can be stored for 3˜15 days.

Problems solved by technology

However, since the preparation process of ferrate is complicated and the investment cost is high, large scale application of ferrate salts is restricted.
However, since the ferrate solution is very unstable, dimethylsulfoxide, dimethyl sulfone and methanol are used in the ferrate purification process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

Preferred Embodiment 1

[0016]According to a high efficiency preparation method for ferrate based on activity in nascent state interface of the preferred embodiment of the present invention, the method comprises the steps of:

[0017](a) adding iron salt to a first alkaline solution having a pH of 5˜9 for hydrolysis and producing an iron solution in nascent state with an equivalent concentration of iron of 0.0001˜1 mol / L;

[0018](b) measuring and obtaining 5˜100 mL of the iron solution in nascent state obtained from step (a), adding oxidizing agent based on a molar ratio of the iron in nascent state and the oxidizing agent at 1:0.1˜20, and allowing to mix to obtain a mixture;

[0019](c) under the condition of 5° C.-60° C., adding 5˜100 mL second alkaline solution with a concentration of 0.1˜16 mol / L or adding 0.2˜70 g alkaline granules to the mixture obtained from the step (b); stirring and mixing for 0.1˜30 min; allowing the solution to turn purplish black color completely and then process ...

embodiment 2

Preferred Embodiment 2

[0021]The difference between this preferred embodiment and the above preferred embodiment 1 is that: in the step (a), the iron salt is one or a combination of the group consisting of: ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate, ferrous chloride and ferric chloride. All others are the same as that of the above preferred embodiment 1.

[0022]According to this embodiment, if the iron salt is a combination of different compounds, the ratio of different compounds can be any ratio.

embodiment 3

Preferred Embodiment 3

[0023]The difference between this preferred embodiment and the above preferred embodiment 1 or 2 is that: in the step (a), the first alkaline solution is one or a combination of the group consisting of: sodium phosphate, disodium hydrogen phosphate solution, sodium aluminate, sodium borate, sodium acetate, sodium bicarbonate solution, sodium carbonate solution, sodium silicate solution, potassium carbonate solution and potassium bicarbonate solution. All others are the same as that of the above preferred embodiment 1 or 2.

[0024]According to this embodiment, if the first alkaline solution is a combination of different compounds, the ratio of different compounds can be any ratio.

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Abstract

A method for efficiently preparing ferrate based on nascent state interfacial activity. The method is as follows: (a) preparing nascent iron solution; (b) adding an oxidizing agent to the iron solution of step (a); (c) adding alkali solution or alkali particles to the mixed solution of step (b), mixing by stirring, and carrying out solid-liquid separation; (d) adding a stabilizing agent to the liquid separated out in step (c), and thus obtaining ferrate solution. The yield is 78-98%. The prepared ferrate solution is stable and can be stored for 3-15 days.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This is a national phase national application of an international patent application number PCT / CN2015 / 071374, filing date Jan. 22, 2015, which claimed priority of Chinese application number 201410029552.5, filing date Jan. 22, 2014. The contents of these specifications, including any intervening amendments thereto, are incorporated herein by reference.BACKGROUND OF THE PRESENT INVENTION[0002]Field of Invention[0003]The present invention relates to a preparation method of a compound, and more particular to a preparation method for ferrate.[0004]Description of Related Arts[0005]Ferrate has a strong oxidizing function under a relatively wide pH range and is capable of oxidizing many organic or inorganic substances. For examples, inorganic compounds such as NH2+, S2O32−, SCN−, H2; heavy metals such as Arsenic and chromium; radioactive substances such as uranium; and organic compounds such as alcohols, acids, amines, hydroxyl-ketones, hydroqui...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C01G49/00
CPCC01G49/0027C01G49/0081C01G49/0036
Inventor MA, JUNLIU, YULEIWANG, LULIU, QINGLIANGZHAO, XIAODAN
Owner HARBIN INST OF TECH